A medical mystery was about to turn into a full-on police investigation… Tonight on an all-new Dateline at 10/9c on NBC. | Dateline NBC

You’re witnessing something highly unusual… Watch the full story tonight at 9/8c on a classic 2-hour Dateline. | Dateline NBC

Cheryl had a nagging feeling… Where was her daughter, Kelsey? The full story tonight at 9/8c on a classic Dateline. | Dateline NBC

Dateline is heading to Nashville for its first live event ahead of its 3,000th episode. They announced the lineup of celebrity moderators, including actors Michael McKean, Annette O'Toole and Holly Robinson Peete! | Today Show